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发育于第四纪更新世母质的黄壤性水稻土土壤钾素肥力属中下等.43个典型剖面和34个耕层土壤全K平均1.43%,缓效K平均359ppm,速效K平均75ppm,钾饱和度1.49%,全钾和有效钾在土体中分布属淋溶型或表层漂洗型.水稻土的钾素含量分异明显,受粘土矿物组成及农业措施的影响.缓效钾和速效钾是与土壤粘粒含量和CEC量呈显著正相关.土壤速效钾和缓效钾能表示土壤的供钾强度和潜力.耗竭试验结果表明,缓效钾提供小麦总吸钾量的84%.校验研究结果表明,速效钾与缓效钾测定值(X)与不施钾肥时小麦的相对产量(Ry)的关系,适合于Mitscheriich生长曲线,速效钾校验曲线方程为log(100-Ry)=log100-0.009x r=0.722,缓效钾为log(100-Ry)=log100-0.0015x r=0.540,前者的拟合程度比后者更好.
Potassium fertility of the yellow-paddy soil developed in the Quaternary Pleistocene parental soil was medium to low, with average K of 1.43%, average K of 359ppm, average K of 75ppm, K Saturation 1.49%, total potassium and available potassium in the soil distribution is leaching or surface rinsing paddy soil potassium content significantly different, affected by the composition of clay minerals and agricultural measures slow and rapid potassium Is positively correlated with soil clay content and CEC content.The soil available potassium and slow potassium can indicate the soil potassium supply strength and potential.The results of exhaustion test showed that slow potassium provided 84% of the total wheat potassium absorption. The results showed that the relationship between the available potassium (K) and the slow-acting K (X) and the relative yield (Ry) of the wheat without K fertilizer was suitable for the Mitscheriich growth curve. The K- log100-0.009xr = 0.722, slow potassium is log (100-Ry) = log100-0.0015xr = 0.540, the former is better than the latter.